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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (SPARK-21431) Unable to parallelize a list in Scala
Date Mon, 17 Jul 2017 07:54:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-21431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen reopened SPARK-21431:
-------------------------------

> Unable to parallelize a list in Scala
> -------------------------------------
>
>                 Key: SPARK-21431
>                 URL: https://issues.apache.org/jira/browse/SPARK-21431
>             Project: Spark
>          Issue Type: Task
>          Components: Spark Submit, Structured Streaming
>    Affects Versions: 2.1.0
>            Reporter: Mounika
>
> I am using RabbitMQ spark streaming connector to process AVRO messages and I am unable
to parallelize a list in scala, getting java.lang.NullPointerException. The same worked when
I was using Kafka spark connector
> messages.foreachRDD( rdd => {
>        for(avroLine <- rdd){
>         val record = Injection.injection.invert(avroLine.getBytes).get
>         val field1Value = record.get("username")
>         val jsonStrings=Seq(record.toString())
>         val newRow = sqlContext.sparkContext.parallelize(Seq(record.toString()))
>             }
>             })
> Output:  jsonStrings...List({"username": "user_118", "tweet": "tweet_218", "timestamp":
18})
> Exception:
>   Caused by: java.lang.NullPointerException
> at com.capitalone.AvroConsumer$$anonfun$main$1$$anonfun$apply$1.apply(AvroConsumer.scala:83)
> at com.capitalone.AvroConsumer$$anonfun$main$1$$anonfun$apply$1.apply(AvroConsumer.scala:74)
> at scala.collection.Iterator$class.foreach(Iterator.scala:893)
> at org.apache.spark.util.CompletionIterator.foreach(CompletionIterator.scala:26)
> at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:917)
> at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:917)
> at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
> at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
> at org.apache.spark.scheduler.Task.run(Task.scala:99)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
> 17/07/16 19:11:00 WARN TaskSetManager: Lost task 0.0 in stage 47.0 (TID 47, localhost,
executor driver): java.lang.NullPointerException
> 	at com.capitalone.AVROMqStreaming$$anonfun$main$1$$anonfun$apply$1.apply(AVROMqStreaming.scala:56)
> 	at com.capitalone.AVROMqStreaming$$anonfun$main$1$$anonfun$apply$1.apply(AVROMqStreaming.scala:46)
> 	at scala.collection.Iterator$class.foreach(Iterator.scala:893)
> 	at org.apache.spark.util.CompletionIterator.foreach(CompletionIterator.scala:26)
> 	at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:917)
> 	at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:917)
> 	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
> 	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
> 	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
> 	at org.apache.spark.scheduler.Task.run(Task.scala:99)
> 	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> Thanks in Advance!!



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